I never have any luck getting these fish to live I have know idea why? For my 20g sometimes I get algae building up so I go buy 2 ottos. They live for sometimes 2 weeks tops and die? This has happened several times over the past few years? My water conditons are always very good. Ph is around 7 and stuff. They don't starve they always die before the tank is algae free. I also give them algae waffers. Its not the other fish either. The only thing I could think of is I use some aquarium salt for health. I don't even use the recommened dose I go under that. Are they maybe really not salt tolerant? I have used the same salt for years. I have raised plecos in the same tank and conditions in the past with no problems and I know they don't like salt either but I don't use alot. I really like ottos they do an awesome job when I can keep them alive. Anyone have input on this? Thanks Much